560 PROF. C. H. o'dONOGHUE : REPORT ON 
Alloiodobis hedleyi mihi. — Colour preserved ; dark muddy-fawn with a 
tinge of green with irregularly scattered dark brown, almost black, 
roughly circular, ring-shaped marks {O'D.). Colour alive: yellowish 
white to greyish brown, covered with minute spiculose elevations on 
the dorsal surface, which impart to it a brownish tint ; also less 
numerous, larger elevations, surrounded by irregular circles of deep 
brown. The latter occasionally have a centre of opaque white 
surrounded by a ring of reddish brown. 
No labial armature. Tentacles small, sub-cylindrical, 1'25 mm. long. 
Size 52 mm. long, 34 mm. wide, 23"5 mm. high. "Radula 33-35 rows 
(55-57) .0 . (5.5-57). Innermost pleurals small, but much like the 
remainder, not like those of A. lanuginata ; outer teeth not denticulate. 
I think it will be seen from the above that three distinct forms appear 
to be represented, of which A. marmorata Bergh and A. hedlei/i mihi, 
vi'hile resembling one another more closely than either of them does A. lanu- 
ginata, are, nevertheless, distinct species. The form described by Basedow 
and Hedley is not the same as that recorded by Bergh^ and hence it is in 
need of a new name. I propose to call it A. hedleyi after Dr. Charles Hedley, 
who has added so much to our knowledge of the marine fauna of Australia. 
Family PLATYDORlDIDiE. 
The body is somewhat flattened, of leathe-ry consistency, sometimes tough 
and sometimes brittle ; it has an oval or sometimes almost circular outline ; 
the notseum is fairly smooth or minutely granulate, the dorsum often marked 
by tubercles or ridges ; the pallial margin is ample ; the branchial aperture 
is generally stellate : the tentacles are digitate ; the anterior margin of the 
foot is bilabiate, and the upper lip indented or split in the middle line. 
There is no labial armature ; the radula lacks rachidial teeth ; the pleural 
teeth are numerous and hamate. 
The prostate gland is large. 
Genus Asteronotus Ehrenberg, 1831. 
Type by monotypy: A. hemprichii Ehrenb. Symb. Phys. (1831). 
The body-form is oval and somewhat flattened ; the animal is of a peculiar 
leathery or india-rubber-like consistencj^, not hard or brittle. The skin is 
smooth to the touch, but covered with raised protuberances in the form of 
ridges, of which one well-marked one runs in the mid-dorsal line from 
between the rhinophores back to the branchial aperture. The margin of 
this aperture is produced into lobes (usually six). The foot is narrow, 
bilabiate anteriorly, and the upper lip indented. 
There is no labial armature; the radula has no median tooth and the 
pleural teeth are simply hamate. 
